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Allosauroidea, a clade of large-bodied theropod dinosaurs that ranged from the Middle
Jurassic until the Late Cretaceous, has been the subject of extensive phylogenetic study. However, despite the publication of 12 cladistic analyses little phylogenetic consensus has emerged, frustrating attempts to use these dinosaurs to study character evolution, biogeography and the quality of the fossil record. Here we analy ... Read more »
Viewings: 1681 | Data: 09.07.2008 | Rating: 0.0/0 | Comments (0)

This field trip covers sedimentological and paleontological research being conducted
on the Jurassic Aztec Sandstone and Lower Cretaceous Willow Tank Formation in Valley of Fire State Park. Valley of Fire State Park is located in southern Nevada, just outside of the town of Overton. The Jurassic Aztec Sandstone is equivalent to the Navajo and Nugget Sandstones; these formations ... Read more »
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Many of the best preserved teeth and bones of archosaurian reptiles found in 1834 in an Upper Triassic Rhaetian fissure fill on Durdham Down in Clifton (now in Bristol), southwest England were destroyed in 1940. Based on an 1875 map, the site is positively identified as within Quarry Steps Quarry. This paper includes an annotated catalogue, copies of most of the illustrations from 1840 to 1908, and photos of import ... Read more »
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Georgenthalia clavinasica, a new genus and species of amphibamid dissorophoid temnospondyl, is represented by a small, complete, postmetamorphic skull from the Lower Permian Bromacker locality, Germany. It is only the third non-amniote of an assemblage of 12 terrestrial tetrapod taxa known from this locality. It is characterized by a broadly rounded skull with large orbits, a short postorbital length, and a unique ... Read more »
Viewings: 1386 | Data: 09.07.2008 | Rating: 0.0/0 | Comments (0)

A theropod dinosaur is described for the first time from the Upper Jurassic of Mongolia. It is represented by a partial skull from the upper Jurassic Dariv Suite in Dariv, Ikhes Nuur Basin, Gobi-Altai Aimag, western Mongolia, situated relatively close to the Xinjiang Uygur Autonomous Province in the western part of China. From the same beds of the locality, sauropod bones were also abundantly found. Those fossil di ... Read more »
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The lectotype of the Middle Jurassic theropod dinosaur Megalosaurus bucklandii, a right dentary, can be diagnosed on the basis of two unique characters: a longitudinal groove on the ventral part of the lateral surface of the dentary and a slit-like anterior Meckelian foramen. This taxon, the first dinosaur to be scientifically described, is therefore valid. Currently, however, no further material can be referred to ... Read more »
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Abstract: A portion of a cranium from the Kimmeridgian La Casita Formation at Zaragoza, Nuevo León, north-eastern Mexico, is described and referred to the thalattosuchian genus Dakosaurus. The specimen is too incomplete for further determination or detailed comparison with forms known from Europe and South America. It represents the second occurrence in the Late Jurassic Mexican Gulf of the genus, which had been co ... Read more »
Viewings: 1214 | Data: 07.07.2008 | Rating: 0.0/0 | Comments (0)

A new ichthyosaur, Platypterygius ochevi sp. nov., from the Albian–Cenomanian of the Voronezh Region is described based on a partial forefin. It differs from congeners in the very large facet for the lageniformis on the humerus.
INTRODUCTION
Remains of the globally distributed ichthyosaur genus Platypterygius occur in the Cretaceous of Russia and adjacent countries. They are usually confined to condensation h ... Read more »
Viewings: 975 | Data: 07.07.2008 | Rating: 0.0/0 | Comments (0)

A new dromaeosaurid dinosaur—Velociraptor osmolskae n. sp.—is described on the basis of associated paired maxillae and a left lacrimal discovered in Campanian (Upper Cretaceous) deposits at Bayan Mandahu (Inner Mongolia, P. R. China). The maxilla of this new taxon is characterized by its long rostral plate and its enlarged, teardrop-shaped promaxillary fenestra, which is as large as the maxillary fenestra. The teet ... Read more »
Viewings: 1348 | Data: 05.07.2008 | Rating: 0.0/0 | Comments (0)

Skeletal remains of dinosaurs from Chile are rare, unlike the ichnological record, which includes sauropods, theropods, and ornithopods, mostly from the Upper Jurassic-Lower Cretaceous. The first record of dinosaur bone in this country—a few remains of a titanosaur
sauropod from the Upper Cretaceous of the Fourth (IV) Región—was reported by Casamiquela et al. (1969). Since then, the reported materials have been ... Read more »
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New specimens of the traversodontid cynodont Menadon besairiei from the Middle/Late Triassic ‘Isalo II’ beds of southwestern Madagascar are described. The new specimens include a skull and the first postcranial material described for this taxon. Although the referred skull differs from the holotype of M. besairiei in some regards, these differences are interpreted as intraspecific variation and preservational artif ... Read more »
Viewings: 1188 | Data: 05.07.2008 | Rating: 0.0/0 | Comments (0)

Several teeth with ceratosaurid affinities from the Tacuarembó Formation (Kimmeridgian–Hautevirian) of Uruguay (South America) are reported herein. The most diagnostic specimen is a small rostral crown (probably the first or second left premaxillary crown), the most conspicuous features of which are the presence of several, well-marked
longitudinal grooves on the lingual face and the absence of mesial denticles. ... Read more »
Viewings: 1157 | Data: 05.07.2008 | Rating: 0.0/0 | Comments (0)

A gavialoid crocodylian from the Maastrichtian of the Oulad Abdoun phosphatic Basin (Morocco) is described, representing the oldest known crocodylian from Africa. The specimen consists of a skull that exhibits several features not found in other gavialoids, and a new genus and species is erected, Ocepesuchus eoafricanus. A phylogenetic
analysis has been conducted including 201 characters and 71 taxa, where Ocepe ... Read more »
Viewings: 1423 | Data: 05.07.2008 | Rating: 0.0/0 | Comments (0)

New material of the fossil crocodyliform taxon Mahajangasuchus insignis from the Upper Cretaceous Maevarano Formation is described. The holotype lacked cranial remains but the new material includes an almost complete skull as well as at least two additional partial skulls. These new specimens add important information and allow us to diagnose Mahajangasuchus insignis as a derived mesoeucrocodylian crocodyliform dis ... Read more »
Viewings: 2087 | Data: 05.07.2008 | Rating: 0.0/0 | Comments (0)

A partial but largely articulated skeleton of a ‘rauisuchian’ archosaur from Late Upper Triassic strata of the Durham sub-basin, Deep River basin, Newark Supergroup, North Carolina, represents a new species of Postosuchus Chatterjee, 1985. It represents the first record of this taxon from eastern North America. The well preserved specimen includes cranial bones, a largely articulated right manus, right and left ped ... Read more »
Viewings: 1046 | Data: 03.07.2008 | Rating: 0.0/0 | Comments (0)

Aspects of the cranial and postcranial anatomy are presented for a new specimen of the Upper Cretaceous Gondwanan snake, Dinilysia patagonica Woodward, 1901, collected near Paso Cordoba, Rio Negro Province, Argentina, during the field season of 2001. The specimen preserves important features of the dentary and postdentary bones (in particular the coronoid and compound bone), the quadrate, and the ventral surface of ... Read more »
Viewings: 1641 | Data: 03.07.2008 | Rating: 0.0/0 | Comments (0)

A new species of the basal tylosaurine mosasaur Taniwhasaurus, is described from materials collected from upper Santonian-lower Campanian marine clastics outcropping near Mikasa City, Island of Hokkaido, Japan. The type species, Taniwhasaurus oweni Hector, 1874, was originally described from a partial frontal and right and left dentaries collected from the middle Campanian, Conway Siltstone Formation at Haumuri Blu ... Read more »
Viewings: 1548 | Data: 03.07.2008 | Rating: 0.0/0 | Comments (0)

A rare partial postcranium and isolated humeri of Nothosaurus from the Lower Muschelkalk of Winterswijk, The Netherlands are described. The partial skeleton consists of a vertebral column with ribs, pectoral girdle elements, and incomplete forelimbs. Because current species-level taxonomy of Nothosaurus is based only on features of
the skull, we examined the postcranial morphology in detail in order to assign t ... Read more »
Viewings: 2140 | Data: 02.07.2008 | Rating: 0.0/0 | Comments (0)

The first in situ turtle egg clutch reported from China comes from the Lower Cretaceous (Albian) Liangtoutang Formation in the Tiantai Basin, Zhejiang Province. This clutch originally contained a minimum of 27 eggs, but four eggs separated from the clutch during excavation. The spherical eggs vary from 34 to 52 mm in diameter. The eggshell is 0.7–1.0 mm thick and has straight, narrow shell units with parallel marg ... Read more »
Viewings: 1329 | Data: 02.07.2008 | Rating: 0.0/0 | Comments (0)

Recent studies have shown that the Middle Jurassic is a key time for understanding the origin and early evolution of crown group turtles, but few turtle-bearing localities from this epoch are known. This study adds to our knowledge by providing a detailed description of two poorly characterized specimens (IVPP-V6507 and IVPP-V8805) from the Middle Jurassic of China that previously were both assigned to the poorly ... Read more »
Viewings: 1013 | Data: 02.07.2008 | Rating: 0.0/0 | Comments (0)

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